Heat rash on top of feet

Sweat trapped beneath warm footwear can irritate the skin and block sweat ducts. On the top of the foot, shoe uppers, straps and sun-warmed materials may add heat or friction. The rash may look like small red bumps and feel prickly. Scaling, distinct borders or marked tenderness can suggest another cause, so a photo and examination may help if the pattern is unclear.

Remove tight shoes when practical and let the feet air. Clean gently, pat dry and use footwear that allows airflow; loosen straps over the affected skin. Avoid scratching, perfumed products and heavy ointments that trap warmth. If the skin feels dry, ask whether a light emollient is appropriate. Do not apply a topical corticosteroid without advice when infection or a different rash is possible.

Arrange a review if the rash persists after cooling, keeps returning with ordinary footwear, or becomes swollen, painful, blistered, crusted or weepy. Get prompt help for fever, severe pain, rapidly spreading redness or difficulty bearing weight. Those features need assessment because they are not typical of a mild heat rash alone.

Could footwear friction be contributing? Does the rash need treatment for heat rash or another condition? Which cream is suitable for the top of my foot?